<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script src="js/jquery-3.7.0.min.js" type="text/javascript" charset="utf-8"></script>
		<script type="text/javascript">
			//文档就绪写法
//			$(document).ready(function(){
//				
//			})
			$(function(){
				$("button").css("background","red");
			})
		</script>
	</head>
	<body>
		<button>按钮</button>
	</body>
</html>
